package com.astrob.util;

import com.astrob.model.LonLat;

import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import zuo.biao.library.util.Log;

/**
 * Created by colin on 2017/6/27.
 */

public class SunRiseSet {
    private static int[] days_of_month_1 = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    private static int[] days_of_month_2 = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    private final static double h = -0.833;//日出日落时太阳的位置
    private final static double UTo = 180.0;//上次计算的日落日出时间，初始迭代值180.0

    //输入日期
//输入经纬度
//判断是否为闰年：若为闰年，返回1；若不是闰年,返回0
    public static boolean leap_year(int year) {
        if (((year % 400 == 0) || (year % 100 != 0) && (year % 4 == 0))) return true;
        else return false;
    }

    //求从格林威治时间公元2000年1月1日到计算日天数days
    public static int days(int year, int month, int date) {
        int i, a = 0;
        for (i = 2000; i < year; i++) {
            if (leap_year(i)) a = a + 366;
            else a = a + 365;
        }
        if (leap_year(year)) {
            for (i = 0; i < month - 1; i++) {
                a = a + days_of_month_2[i];
            }
        } else {
            for (i = 0; i < month - 1; i++) {
                a = a + days_of_month_1[i];
            }
        }
        a = a + date;
        return a;
    }

    //求格林威治时间公元2000年1月1日到计算日的世纪数t
    public static double t_century(int days, double UTo) {
        return ((double) days + UTo / 360) / 36525;
    }

    //求太阳的平黄径
    public static double L_sun(double t_century) {
        return (280.460 + 36000.770 * t_century);
    }

    //求太阳的平近点角
    public static double G_sun(double t_century) {
        return (357.528 + 35999.050 * t_century);
    }

    //求黄道经度
    public static double ecliptic_longitude(double L_sun, double G_sun) {
        return (L_sun + 1.915 * Math.sin(G_sun * Math.PI / 180) + 0.02 * Math.sin(2 * G_sun * Math.PI / 180));
    }

    //求地球倾角
    public static double earth_tilt(double t_century) {
        return (23.4393 - 0.0130 * t_century);
    }

    //求太阳偏差
    public static double sun_deviation(double earth_tilt, double ecliptic_longitude) {
        return (180 / Math.PI * Math.asin(Math.sin(Math.PI / 180 * earth_tilt) * Math.sin(Math.PI / 180 * ecliptic_longitude)));
    }

    //求格林威治时间的太阳时间角GHA
    public static double GHA(double UTo, double G_sun, double ecliptic_longitude) {
        return (UTo - 180 - 1.915 * Math.sin(G_sun * Math.PI / 180) - 0.02 * Math.sin(2 * G_sun * Math.PI / 180) + 2.466 * Math.sin(2 * ecliptic_longitude * Math.PI / 180) - 0.053 * Math.sin(4 * ecliptic_longitude * Math.PI / 180));
    }

    //求修正值e
    public static double e(double h, double glat, double sun_deviation) {
        return 180 / Math.PI * Math.acos((Math.sin(h * Math.PI / 180) - Math.sin(glat * Math.PI / 180) * Math.sin(sun_deviation * Math.PI / 180)) / (Math.cos(glat * Math.PI / 180) * Math.cos(sun_deviation * Math.PI / 180)));
    }

    //求日出时间
    public static double UT_rise(double UTo, double GHA, double glong, double e) {
        return (UTo - (GHA + glong + e));
    }

    //求日落时间
    public static double UT_set(double UTo, double GHA, double glong, double e) {
        return (UTo - (GHA + glong - e));
    }

    //判断并返回结果（日出）
    public static double result_rise(double UT, double UTo, double glong, double glat, int year, int month, int date) {
        double d;
        if (UT >= UTo) d = UT - UTo;
        else d = UTo - UT;
        if (d >= 0.1) {
            UTo = UT;
            UT = UT_rise(UTo,
                    GHA(UTo, G_sun(t_century(days(year, month, date), UTo)),
                            ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
                                    G_sun(t_century(days(year, month, date), UTo)))),
                    glong,
                    e(h, glat, sun_deviation(earth_tilt(t_century(days(year, month, date), UTo)),
                            ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
                                    G_sun(t_century(days(year, month, date), UTo))))));
            result_rise(UT, UTo, glong, glat, year, month, date);

        }
        return UT;
    }

    //判断并返回结果（日落）
    public static double result_set(double UT, double UTo, double glong, double glat, int year, int month, int date) {
        double d;
        if (UT >= UTo) d = UT - UTo;
        else d = UTo - UT;
        if (d >= 0.1) {
            UTo = UT;
            UT = UT_set(UTo,
                    GHA(UTo, G_sun(t_century(days(year, month, date), UTo)),
                            ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
                                    G_sun(t_century(days(year, month, date), UTo)))),
                    glong,
                    e(h, glat, sun_deviation(earth_tilt(t_century(days(year, month, date), UTo)),
                            ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
                                    G_sun(t_century(days(year, month, date), UTo))))));
            result_set(UT, UTo, glong, glat, year, month, date);
        }
        return UT;
    }

    //求时区
    public static int Zone(double glong) {
        if (glong >= 0) return (int) ((int) (glong / 15.0) + 1);
        else return (int) ((int) (glong / 15.0) - 1);
    }

    //打印结果
// public static void output(double rise, double set, double glong){
//     if((int)(60*(rise/15+Zone(glong)-(int)(rise/15+Zone(glong))))<10)
//         System.out.println("The time at which the sunrise is: "+(int)(rise/15+Zone(glong))+":"+(int)(60*(rise/15+Zone(glong)-(int)(rise/15+Zone(glong))))+" .\n");
//     else System.out.println("The time at which the sunrise is: "+(int)(rise/15+Zone(glong))+":"+(int)(60*(rise/15+Zone(glong)-(int)(rise/15+Zone(glong))))+" .\n");
//
//     if((int)(60*(set/15+Zone(glong)-(int)(set/15+Zone(glong))))<10)
//         System.out.println("The time at which the sunset is: "+(int)(set/15+Zone(glong))+": "+(int)(60*(set/15+Zone(glong)-(int)(set/15+Zone(glong))))+" .\n");
//     else System.out.println("The time at which the sunset is: "+(int)(set/15+Zone(glong))+":"+(int)(60*(set/15+Zone(glong)-(int)(set/15+Zone(glong))))+" .\n");
// }


    public static String getSunrise(LonLat geoPoint, long sunTime) {
        double sunrise, glong, glat;
        int year, month, date;

        glong = geoPoint.GetLon();
        glat = geoPoint.GetLat();

        SimpleDateFormat formatter = new SimpleDateFormat(
                "yyyy-M-d");
        Date curDate = new Date(sunTime);
        String res = formatter.format(curDate);
        String SS[] = res.split("-");
        year = Integer.valueOf(SS[0]);
        month = Integer.valueOf(SS[1]);
        date = Integer.valueOf(SS[2]);

        sunrise = result_rise(UT_rise(UTo,
                GHA(UTo, G_sun(t_century(days(year, month, date), UTo)),
                        ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
                                G_sun(t_century(days(year, month, date), UTo)))),
                glong,
                e(h, glat, sun_deviation(earth_tilt(t_century(days(year, month, date), UTo)),
                        ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
                                G_sun(t_century(days(year, month, date), UTo)))))), UTo, glong, glat, year, month, date);
//        return "Sunrise is: " + (int) (sunrise / 15 + 8) + ":" + (int) (60 * (sunrise / 15 + 8 - (int) (sunrise / 15 + 8))) + " .\n";
        DecimalFormat DF = new DecimalFormat("00");

        Calendar baseCalendar = Calendar.getInstance();
        baseCalendar.setTime(curDate);
        int baseDstOffest = baseCalendar.get(Calendar.DST_OFFSET);

        TimeZone tz = TimeZone.getDefault();
        String strTz = tz.getDisplayName(false, TimeZone.SHORT);
        String ID = tz.getID();
        int shiqu = tz.getOffset(sunTime)/3600000 + baseDstOffest;//如果是夏令时则+1

        String strA = DF.format((int) (sunrise / 15 + shiqu)) + ":" + DF.format((int) (60 * (sunrise / 15 + shiqu - (int) (sunrise / 15 + shiqu))));
        return strA;
    }

    public static String getSunset(LonLat geoPoint, long sunTime) {
        double sunset, glong, glat;
        int year, month, date;

        glong = geoPoint.GetLon();
        glat = geoPoint.GetLat();

        SimpleDateFormat formatter = new SimpleDateFormat(
                "yyyy-M-d");
        Date curDate = new Date(sunTime);
        String res = formatter.format(curDate);
        String SS[] = res.split("-");
        year = Integer.valueOf(SS[0]);
        month = Integer.valueOf(SS[1]);
        date = Integer.valueOf(SS[2]);

        sunset = result_set(UT_set(UTo,
                GHA(UTo, G_sun(t_century(days(year, month, date), UTo)),
                        ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
                                G_sun(t_century(days(year, month, date), UTo)))),
                glong,
                e(h, glat, sun_deviation(earth_tilt(t_century(days(year, month, date), UTo)),
                        ecliptic_longitude(L_sun(t_century(days(year, month, date), UTo)),
                                G_sun(t_century(days(year, month, date), UTo)))))), UTo, glong, glat, year, month, date);
//        return "Sunset is: " + (int) (sunset / 15 + 8) + ":" + (int) (60 * (sunset / 15 + 8 - (int) (sunset / 15 + 8))) + " .\n";
        DecimalFormat DF = new DecimalFormat("00");

        Calendar baseCalendar = Calendar.getInstance();
        baseCalendar.setTime(curDate);
        int baseDstOffest = baseCalendar.get(Calendar.DST_OFFSET);

        TimeZone tz = TimeZone.getDefault();
        String strTz = tz.getDisplayName(false, TimeZone.SHORT);
        String ID = tz.getID();
        int shiqu = tz.getOffset(sunTime)/3600000 + baseDstOffest;//如果是夏令时则+1
        String strA = DF.format((int) (sunset / 15 + shiqu)) + ":" + DF.format((int) (60 * (sunset / 15 + shiqu - (int) (sunset / 15 + shiqu))));
        return strA;
    }
}